US7183019B2 - Negative active material composition for a rechargeable lithium battery, method of producing a negative electrode for a rechargeable lithium battery using the same, and rechargeable lithium battery fabricated using the same - Google Patents
Negative active material composition for a rechargeable lithium battery, method of producing a negative electrode for a rechargeable lithium battery using the same, and rechargeable lithium battery fabricated using the same Download PDFInfo
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- US7183019B2 US7183019B2 US10/371,299 US37129903A US7183019B2 US 7183019 B2 US7183019 B2 US 7183019B2 US 37129903 A US37129903 A US 37129903A US 7183019 B2 US7183019 B2 US 7183019B2
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- active material
- rechargeable lithium
- lithium battery
- negative electrode
- additive
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- 239000007773 negative electrode material Substances 0.000 title claims abstract description 40
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 29
- 239000000203 mixture Substances 0.000 title claims abstract description 27
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000000654 additive Substances 0.000 claims abstract description 26
- 230000000996 additive effect Effects 0.000 claims abstract description 26
- 239000011230 binding agent Substances 0.000 claims abstract description 23
- 239000003792 electrolyte Substances 0.000 claims abstract description 15
- 239000003960 organic solvent Substances 0.000 claims abstract description 12
- 150000001875 compounds Chemical class 0.000 claims description 11
- AFOSIXZFDONLBT-UHFFFAOYSA-N divinyl sulfone Chemical group C=CS(=O)(=O)C=C AFOSIXZFDONLBT-UHFFFAOYSA-N 0.000 claims description 8
- 229910052698 phosphorus Inorganic materials 0.000 claims description 7
- 229910052717 sulfur Inorganic materials 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 230000002687 intercalation Effects 0.000 claims description 5
- 238000009830 intercalation Methods 0.000 claims description 5
- 239000007774 positive electrode material Substances 0.000 claims description 5
- 229910018699 LixCo1-yMy Inorganic materials 0.000 claims description 4
- 229910018707 LixCo1−yMy Inorganic materials 0.000 claims description 4
- 229910017206 LixMn1-yMy Inorganic materials 0.000 claims description 4
- 229910017203 LixMn1−yMy Inorganic materials 0.000 claims description 4
- 229910016210 LixNi1-y-zCoyMz Inorganic materials 0.000 claims description 4
- 229910016254 LixNi1-y-zMnyMz Inorganic materials 0.000 claims description 4
- 229910014218 LixNi1-yMy Inorganic materials 0.000 claims description 4
- 229910014350 LixNi1−yMy Inorganic materials 0.000 claims description 4
- 229910014281 LixNi1−y−zCoyMz Inorganic materials 0.000 claims description 4
- 229910014290 LixNi1−y−zMnyMz Inorganic materials 0.000 claims description 4
- 239000003575 carbonaceous material Substances 0.000 claims description 4
- 229910052731 fluorine Inorganic materials 0.000 claims description 4
- 239000007784 solid electrolyte Substances 0.000 claims description 4
- 229910015349 LixMn2O4-z Inorganic materials 0.000 claims description 2
- 229910015310 LixMn2O4−z Inorganic materials 0.000 claims description 2
- 229910014210 LixNi1-yCoyO2-z Inorganic materials 0.000 claims description 2
- 229910014331 LixNi1−yCoyO2−z Inorganic materials 0.000 claims description 2
- 229910052804 chromium Inorganic materials 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 229910052749 magnesium Inorganic materials 0.000 claims description 2
- 229910052748 manganese Inorganic materials 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 2
- 229910052712 strontium Inorganic materials 0.000 claims description 2
- 229910052720 vanadium Inorganic materials 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 claims 1
- 238000000576 coating method Methods 0.000 claims 1
- 238000001035 drying Methods 0.000 claims 1
- 239000002002 slurry Substances 0.000 description 12
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 9
- 239000007788 liquid Substances 0.000 description 8
- -1 lithium hexafluorophosphate Chemical compound 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 description 4
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 4
- 229910001290 LiPF6 Inorganic materials 0.000 description 4
- 239000002033 PVDF binder Substances 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 230000008961 swelling Effects 0.000 description 4
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 3
- 229910032387 LiCoO2 Inorganic materials 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 229920001155 polypropylene Polymers 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 238000001291 vacuum drying Methods 0.000 description 3
- 229910003481 amorphous carbon Inorganic materials 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910001496 lithium tetrafluoroborate Inorganic materials 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000007086 side reaction Methods 0.000 description 2
- FSSPGSAQUIYDCN-UHFFFAOYSA-N 1,3-Propane sultone Chemical compound O=S1(=O)CCCO1 FSSPGSAQUIYDCN-UHFFFAOYSA-N 0.000 description 1
- ZVYSYCLZXICWLH-UHFFFAOYSA-N 1,3-dioxetan-2-one Chemical compound O=C1OCO1 ZVYSYCLZXICWLH-UHFFFAOYSA-N 0.000 description 1
- VAYTZRYEBVHVLE-UHFFFAOYSA-N 1,3-dioxol-2-one Chemical compound O=C1OC=CO1 VAYTZRYEBVHVLE-UHFFFAOYSA-N 0.000 description 1
- 229910001558 CF3SO3Li Inorganic materials 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 229910021383 artificial graphite Inorganic materials 0.000 description 1
- 239000005539 carbonized material Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 150000005676 cyclic carbonates Chemical class 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000009831 deintercalation Methods 0.000 description 1
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 1
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 description 1
- 229910021385 hard carbon Inorganic materials 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- MHCFAGZWMAWTNR-UHFFFAOYSA-M lithium perchlorate Chemical compound [Li+].[O-]Cl(=O)(=O)=O MHCFAGZWMAWTNR-UHFFFAOYSA-M 0.000 description 1
- MCVFFRWZNYZUIJ-UHFFFAOYSA-M lithium;trifluoromethanesulfonate Chemical compound [Li+].[O-]S(=O)(=O)C(F)(F)F MCVFFRWZNYZUIJ-UHFFFAOYSA-M 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011302 mesophase pitch Substances 0.000 description 1
- KKQAVHGECIBFRQ-UHFFFAOYSA-N methyl propyl carbonate Chemical compound CCCOC(=O)OC KKQAVHGECIBFRQ-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910021382 natural graphite Inorganic materials 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 229910021384 soft carbon Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/133—Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the present invention relates to a negative active material composition, a method of producing a negative electrode rechargeable lithium battery using the same and a rechargeable lithium battery fabricated using the same, and more particularly, to a negative active material composition which is capable of preventing generation of gas, a method of preparing a negative electrode for a rechargeable lithium battery using the composition, and a rechargeable lithium battery fabricated using the composition.
- a potential gap between a positive electrode and a negative electrode occurs at initial charging.
- Such potential gap allows a surface of the negative electrode to react with an electrolyte, thereby producing a solid electrolyte interface (SEI) film on the surface of the negative electrode.
- SEI solid electrolyte interface
- the SEI film helps to intercalate and deintercalate lithium ions into the negative electrode.
- decomposition of the electrolyte which is a side reaction simultaneously occurs, which generates gas, thereby raising the internal pressure of the battery.
- a swelling phenomenon occurs in which the battery thickens, the battery capacity is reduced, and it is difficult to produce various types of batteries in rectangular shapes because of the distortion.
- the invention is directed to a negative active material composition for a rechargeable lithium battery including a negative active material, an additive, a binder, and an organic solvent.
- the additive is capable of forming a solid surface interface film on a surface of a negative electrode during charge and discharge.
- the negative active material comprises a carbonaceous material.
- the present invention also provides a method of preparing a negative electrode for a rechargeable lithium battery.
- the additive, the binder, the negative active material, and the organic solvent are mixed to prepare the negative active material composition, and the composition is coated on a current collector.
- the present invention is also directed to a rechargeable lithium battery including the negative electrode with the additive and the negative active material, a positive electrode with a lithiated intercalation positive active material, and an electrolyte.
- FIG. 1 shows a rechargeable lithium battery according to an embodiment of the present invention.
- the present invention relates to prevention of a swelling phenomenon caused by gas generation, which is a side reaction of SEI film production.
- gas generation occurs due to the reaction between a surface of the negative electrode and an electrolyte when a battery is initially charged to form an SEI film on the surface of the negative electrode.
- the present invention employs a material that can form an SEI film on a surface of the negative electrode during initial charging without gas generation and deterioration of the battery performance.
- Such a material may include a compound with S or P, or a carbonate-based compound.
- the compound with S or P includes a S ⁇ O bond or a P ⁇ O bond in its molecular structure.
- examples of the compound with S or P include vinyl sulfone, SO 2 gas, and 1,3-propanesultone, and an example of the carbonate-based compound is vinylene carbonate.
- a compound containing the SEI film components may be used.
- the additive when added to a negative active material composition, prevents the reaction between the surface of the negative electrode and the electrolyte at initial charging, thereby inhibiting gas generation, which results in the prevention of an increase in thickness of the battery and a decrease in capacity.
- the negative active material composition of the present invention includes one or more carbonaceous materials, which are known as negative active materials. That is, any compound that advances an electrochemical redox reaction and in which intercalation and deintercalation of lithium ions reversibly occurs, may be used, examples of which include amorphous carbon and crystalline carbon.
- the amorphous carbon may be soft carbon, hard carbon, a mesophase pitch carbonized material, or coke.
- the crystalline carbon may be shapeless, plate-shaped, flake-shaped, globular, or fiber-type natural graphite or artificial graphite.
- the negative active material composition includes an organic solvent.
- the organic solvent may be any solvent known in the related art, such as N-methyl pyrrolidone.
- the amounts of the solvent and the negative active material are not critical in the present invention, but should be sufficient to provide a suitable viscosity so that the composition is readily coated on the current collector.
- the negative active material composition may further include a binder to adhere the active material to the current collector.
- the binder can be any conventional binder used for a conventional negative active material composition as long as the binder is soluble in the solvent used.
- An example of the binder is polyvinylidene fluoride.
- An additive is admixed with an organic solvent, and a binder is added to the resulting mixture, thereby obtaining a binder liquid.
- a negative active material is added to the binder liquid to prepare a negative active material composition.
- the amounts of the solvent and the negative active material are not critical in the present invention, but should be sufficient to provide a suitable viscosity so that the composition is readily coated on the current collector.
- the negative active material composition is coated on a current collector to produce a negative electrode in which a negative active mass (a mixture of the negative active material, the binder, and the additive) is formed on the current collector.
- the amount of the additive is preferably 0.01 to 1.0 wt % based on the weight of the negative active mass.
- a rechargeable lithium battery is fabricated according to any procedure known in the related art.
- the positive electrode includes a lithiated intercalation compound positive active material, and the lithiated intercalation compound is selected from compounds represented by formulas 1 to 12: Li x Mn 1-y M y A 2 (1) Li x Mn 1-y M y O 2-z X z (2) Li x Mn 2 O 4-z X z (3) Li x Co 1-y M y A 2 (4) Li x Co 1-y M y O 2-z X z (5) Li x Ni 1-y M y A 2 (6) Li x Ni 1-y M y O 2-z X z (7) Li x Ni 1-y Co y O 2-z X z (8) Li x Ni 1-y-z Co y M z A ⁇ (9) Li x Ni 1-y-z Co y M z O 2- ⁇ X ⁇ (10) Li x Ni 1-y-z Mn y M z A ⁇ (11) Li x Ni 1-y-z Mn y M z O 2- ⁇ X ⁇ (12)
- the electrolyte includes a supporting salt and an organic solvent.
- the supporting salt may be any salt as long as it activates the movement of lithium ions between the positive electrode and the negative electrode. Examples thereof include lithium hexafluorophosphate (LiPF 6 ), lithium tetrafluoroborate (LiBF 4 ), lithium hexafluoroarsenate (LiAsF 6 ), lithium perchlorate (LiClO 4 ), lithium trifluoromethanesulfonate (CF 3 SO 3 Li), and mixtures thereof.
- the organic solvent may be a cyclic carbonate, such as ethylene carbonate or methylene carbonate, or a linear carbonate, such as dimethyl carbonate, diethyl carbonate, ethylmethyl carbonate, or methylpropyl carbonate.
- a cyclic carbonate such as ethylene carbonate or methylene carbonate
- a linear carbonate such as dimethyl carbonate, diethyl carbonate, ethylmethyl carbonate, or methylpropyl carbonate.
- a rechargeable lithium battery according to an embodiment of the present invention is shown in FIG. 1 and includes a case 1 containing a positive electrode 3 , a negative electrode 4 , and a separator 2 interposed between the positive electrode 3 and the negative electrode 4 .
- a case 1 containing a positive electrode 3 , a negative electrode 4 , and a separator 2 interposed between the positive electrode 3 and the negative electrode 4 .
- other lithium batteries can be constructed using the positive active material according to the present invention.
- wt % of vinyl sulfone was added to 39.91 wt % of N-methyl pyrrolidone. They were mixed for approximately 10 minutes to completely dissolve vinyl sulfone in N-methyl pyrrolidone. 3.59 wt % of a polyvinylidene fluoride binder was added to the resulting mixture and mixed to prepare a binder liquid. 56.28 wt % of a graphite negative active material was added to the binder liquid to prepare a negative active material slurry. Thereafter, bubbles that were generated in the slurry were removed therefrom, and the resulting material was shaken and aged for approximately 10 hours. As a result, a negative active material slurry was prepared.
- the slurry was coated on a Cu current collector in a predetermined thickness and dried at 150° C. to evaporate N-methyl pyrrolidone, thereby producing a negative electrode.
- the dried collector was pressed and cut, followed by vacuum drying at 150° C. for 10 minutes to remove any remaining N-methyl pyrrolidone from the collector.
- an ICP503465A-type rechargeable lithium cell was fabricated.
- an electrolyte 1M LiPF 6 in ethylene carbonate and diethyl carbonate was used.
- 3.6 wt % of a polyvinylidene fluoride binder was added to 40 wt % of N-methyl pyrrolidone and mixed to prepare a binder liquid.
- 56.4 wt % of a graphite negative active material was added to the binder liquid to prepare a negative active material slurry. Thereafter, bubbles that were generated in the slurry were removed therefrom, and the resulting material was shaken and aged for approximately 10 hours. As a result, a negative active material slurry was prepared.
- the slurry was coated on a Cu current collector in a predetermined thickness and dried at 150° C. to evaporate N-methyl pyrrolidone, thereby producing a negative electrode.
- the dried collector was pressed and cut followed by vacuum drying at 150° C. for 10 minutes to remove any remaining N-methyl pyrrolidone from the collector.
- an ICP503465A-type rechargeable lithium cell was fabricated.
- an electrolyte 1M LiPF 6 in ethylene carbonate and diethyl carbonate was used.
- Example 1 The rechargeable lithium cells according to Example 1 and Comparative Example 1 were charged, and the thickness of the cells were measured before and after charging.
- the thickness of the cell according to Comparative Example 1 increased by 0.8 mm after charging, but the thickness of the cell according to Example 1 only increased by 0.3 mm before and after charging. It can be seen from these results that the additive used in Example 1 effectively represses swelling so that the increase in the thickness is reduced to less than 38% of that of the conventional electrode.
- 3.6 wt % of a polyvinylidene fluoride binder was added to 40 wt % of N-methyl pyrrolidone and mixed to prepare a binder liquid.
- 56.4 wt % of a graphite negative active material was added to the binder liquid to prepare a negative active material slurry. Thereafter, bubbles that were generated in the slurry were removed therefrom, and the resulting material was shaken and aged for approximately 10 hours. As a result, a negative active material slurry was prepared.
- the slurry was coated on a Cu current collector in a predetermined thickness and dried at 150° C. to evaporate N-methyl pyrrolidone, thereby producing a negative electrode.
- the dried collector was pressed and cut followed by vacuum drying at 150° C. for 10 minutes to remove any remaining N-methyl pyrrolidone from the collector.
- an ICP503465A-type rechargeable lithium cell was fabricated.
- the electrolyte was prepared by adding vinyl sulfone to a mixed organic solvent (ethylene carbonate and diethyl carbonate) in which 1M LiPF 6 was dissolved.
- the amount of vinyl sulfone was 0.75 wt % based on the mixed organic solvent.
- the cells according to Example 1 and Comparative Example 2 were charged and the thicknesses of the cells were measured before and after charging.
- the increases in the thickness of the cells according to Example 1 and Comparative Example 2 were identically about 0.3 mm.
- the surface of the negative electrode was found to be entirely covered with lithium metal, which results in the deterioration of low-temperature discharge, high-rate discharge, and cycle life characteristics.
- the negative electrode according to Example 1 was separated from the charged cell, no lithium metal was found on the surface of the negative electrode.
- the cells according to Example 1 and Comparative Example 1 had similar swelling repression effects, the cell according to Example 1 retained its battery performance, but the cell according to Comparative Example 1 had deteriorated battery performance.
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- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Battery Electrode And Active Subsutance (AREA)
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Abstract
Description
LixMn1-yMyA2 (1)
LixMn1-yMyO2-zXz (2)
LixMn2O4-zXz (3)
LixCo1-yMyA2 (4)
LixCo1-yMyO2-zXz (5)
LixNi1-yMyA2 (6)
LixNi1-yMyO2-zXz (7)
LixNi1-yCoyO2-zXz (8)
LixNi1-y-zCoyMzAα (9)
LixNi1-y-zCoyMzO2-αXα (10)
LixNi1-y-zMnyMzAα (11)
LixNi1-y-zMnyMzO2-αXα (12)
where 0.9≦x≦1.1, 0≦y≦0.5, 0≦z≦0.5, 0≦α≦2; M is at least one element selected from the group consisting of Al, Ni, Co, Mn, Cr, Fe, Mg, Sr, V, and rare earth elements; A is selected from the group consisting of O, F, S, and P; and X is selected from the group consisting of F, S, and P.
Claims (6)
LixMn1-yMyA2 (1)
LixMn1-yMyO2-zXz (2)
LixMn2O4-zXz (3)
LixCo1-yMyA2 (4)
LixCo1-yMyO2-zXz (5)
LixNi1-yMyA2 (6)
LixNi1-yMyO2-zXz (7)
LixNi1-yCoyO2-zXz (8)
LixNi1-y-zCoyMzAα (9)
LixNi1-y-zCoyMzO2-αXα (10)
LixNi1-y-zMnyMzAα (11)
LixNi1-y-zMnyMzO2-αXα (12)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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KR10-2002-0011952A KR100424644B1 (en) | 2002-03-06 | 2002-03-06 | Negative active material slurry composition for rechargeable lithium battery and method of preparing negative electrode for rechargeable lithium battery prepared using same |
KR2002-11952 | 2002-03-06 |
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Publication Number | Publication Date |
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US20030170534A1 US20030170534A1 (en) | 2003-09-11 |
US7183019B2 true US7183019B2 (en) | 2007-02-27 |
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US10/371,299 Expired - Lifetime US7183019B2 (en) | 2002-03-06 | 2003-02-21 | Negative active material composition for a rechargeable lithium battery, method of producing a negative electrode for a rechargeable lithium battery using the same, and rechargeable lithium battery fabricated using the same |
Country Status (4)
Country | Link |
---|---|
US (1) | US7183019B2 (en) |
JP (1) | JP4018560B2 (en) |
KR (1) | KR100424644B1 (en) |
CN (2) | CN102110815B (en) |
Cited By (2)
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
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US20070190419A1 (en) * | 2004-03-16 | 2007-08-16 | Hideharu Takezawa | Lithium secondary battery |
US8389163B2 (en) | 2004-03-16 | 2013-03-05 | Panasonic Corporation | Lithium secondary battery containing organic peroxide in non-aqueous electrolyte, positive electrode, or negative electrode |
US9827602B2 (en) | 2015-09-28 | 2017-11-28 | Tesla, Inc. | Closed-loop thermal servicing of solvent-refining columns |
US10293386B2 (en) | 2015-09-28 | 2019-05-21 | Tesla, Inc. | Closed-loop thermal servicing of solvent-refining columns |
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Also Published As
Publication number | Publication date |
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JP2003263988A (en) | 2003-09-19 |
KR20030072765A (en) | 2003-09-19 |
CN102110815B (en) | 2014-07-02 |
KR100424644B1 (en) | 2004-03-25 |
CN1442915A (en) | 2003-09-17 |
CN102110815A (en) | 2011-06-29 |
JP4018560B2 (en) | 2007-12-05 |
US20030170534A1 (en) | 2003-09-11 |
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